BC 548 (npn) transistor, resistor 1/4 watts, polyester capacitor and electrolytic output.
About buffers:
A recurring question often seen is how to add a buffer to a circuit to avoid loading and loss of definition of the guitar sound. The buffers feature high impedance to the guitar pickup and have a low impedance output drive with gain close to unity (unity gain = 1). This is a great addition in front of a vintage wah-wah or other circuit that can steal the high frequency response signal. Buffers are simple, easy, and inexpensive to build. (Note: Any buffers can also be used on the output of an effect circuit).
